<!DOCTYPE html>
<html>
  <head>
    <title>Custom Tooltips</title>
    <link rel="stylesheet" href="https://openlayers.org/en/v4.3.2/css/ol.css" type="text/css">
    <!-- The line below is only needed for old environments like Internet Explorer and Android 4.x -->
    <script src="https://cdn.polyfill.io/v2/polyfill.min.js?features=requestAnimationFrame,Element.prototype.classList,URL"></script>
    <script src="https://openlayers.org/en/v4.3.2/build/ol.js"></script>
    <script src="https://code.jquery.com/jquery-2.2.3.min.js"></script>
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css">
    <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js"></script>
    <style>
      .tooltip-inner {
        white-space: nowrap;
      }
    </style>
  </head>
  <body>
    <div id="map" class="map"></div>
    <script>
      var map = new ol.Map({
        layers: [
          new ol.layer.Tile({
            source: new ol.source.OSM()
          })
        ],
        target: 'map',
        view: new ol.View({
          center: [-8730000, 5930000],
          rotation: Math.PI / 5,
          zoom: 8
        })
      });


      $('.ol-zoom-in, .ol-zoom-out').tooltip({
        placement: 'right'
      });
      $('.ol-rotate-reset, .ol-attribution button[title]').tooltip({
        placement: 'left'
      });
    </script>
  </body>
</html>